Tangrams

Tangrams are a puzzle that help develop spatial-visualization skills,
but they may also be used to introduce or reinforce geometrical
concepts such as congruency, similarity, symmetry, and so forth. This
unit for grades 4 through 6 uses tangrams to compute the
area of polygons without formulas. In the process of
doing so, the terms congruent and
similar are introduced.

My son, Brian Scavo, produced a seemingly endless flow of
geometric constructions using tangrams, some of which will be seen
on these pages. Now if only I had time to convert more of Brian's
cool drawings into computer images!